caff/caff

   1 #!/usr/bin/perl -w
   2
   3 # caff  --  CA - Fire and Forget
   4 # $Id$
   5 #
   6 # Copyright (c) 2004, 2005 Peter Palfrader <peter@palfrader.org>
   7 # Copyright (c) 2005, 2006 Christoph Berg <cb@df7cb.de>
   8 #
   9 # All rights reserved.
  10 #
  11 # Redistribution and use in source and binary forms, with or without
  12 # modification, are permitted provided that the following conditions
  13 # are met:
  14 # 1. Redistributions of source code must retain the above copyright
  15 #    notice, this list of conditions and the following disclaimer.
  16 # 2. Redistributions in binary form must reproduce the above copyright
  17 #    notice, this list of conditions and the following disclaimer in the
  18 #    documentation and/or other materials provided with the distribution.
  19 # 3. The name of the author may not be used to endorse or promote products
  20 #    derived from this software without specific prior written permission.
  21 #
  22 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  23 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25 # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32
  33 =pod
  34
  35 =head1 NAME
  36
  37 caff -- CA - Fire and Forget
  38
  39 =head1 SYNOPSIS
  40
  41 =over
  42
  43 =item B<caff> [-eEmMRS] [-u I<yourkeyid>] I<keyid> [I<keyid> ..]
  44
  45 =back
  46
  47 =head1 DESCRIPTION
  48
  49 CA Fire and Forget is a script that helps you in keysigning.  It takes a list
  50 of keyids on the command line, fetches them from a keyserver and calls GnuPG so
  51 that you can sign it.  It then mails each key to all its email addresses - only
  52 including the one UID that we send to in each mail, pruned from all but self
  53 sigs and sigs done by you.  The mailed key is encrypted with itself as a means
  54 to verify that key belongs to the recipient.
  55
  56 =head1 OPTIONS
  57
  58 =over
  59
  60 =item B<-e>, B<--export-old>
  61
  62 Export old signatures. Default is to ask the user for each old signature.
  63
  64 =item B<-E>, B<--no-export-old>
  65
  66 Do not export old signatures. Default is to ask the user for each old
  67 signature.
  68
  69 =item B<-m>, B<--mail>
  70
  71 Send mail after signing. Default is to ask the user for each uid.
  72
  73 =item B<-M>, B<--no-mail>
  74
  75 Do not send mail after signing. Default is to ask the user for each uid.
  76
  77 =item B<-R>, B<--no-download>
  78
  79 Do not retrieve the key to be signed from a keyserver.
  80
  81 =item B<-S>, B<--no-sign>
  82
  83 Do not sign the keys.
  84
  85 =item B<-u> I<yourkeyid>, B<--local-user> I<yourkeyid>
  86
  87 Select the key that is used for signing, in case you have more than one key.
  88 To sign with multiple keys at once, separate multiple keyids by comma.
  89
  90 =item B<--key-file> I<file>
  91
  92 Import keys from file. Can be supplied more than once.
  93
  94 =back
  95
  96 =head1 FILES
  97
  98 =over
  99
 100 =item $HOME/.caffrc  -  configuration file
 101
 102 =item $HOME/.caff/keys/yyyy-mm-dd/  -  processed keys
 103
 104 =item $HOME/.caff/gnupghome/  -  caff's working dir for gpg
 105
 106 =item $HOME/.caff/gnupghome/gpg.conf  -  gpg configuration
 107
 108 useful options include use-agent, default-cert-level, etc.
 109
 110 =back
 111
 112 =head1 CONFIGURATION FILE OPTIONS
 113
 114 The configuration file is a perl script that sets values in the hash B<%CONFIG>.
 115 The file is generated when it does not exist.
 116
 117 Example:
 118
 119         $CONFIG{owner} = q{Peter Palfrader};
 120         $CONFIG{email} = q{peter@palfrader.org};
 121         $CONFIG{keyid} = [ qw{DE7AAF6E94C09C7F 62AF4031C82E0039} ];
 122
 123 =head2 Required basic settings
 124
 125 =over
 126
 127 =item B<owner> [string]
 128
 129 Your name.  B<REQUIRED>.
 130
 131 =item B<email> [string]
 132
 133 Your email address, used in From: lines.  B<REQUIRED>.
 134
 135 =item B<keyid> [list of keyids]
 136
 137 A list of your keys.  This is used to determine which signatures to keep
 138 in the pruning step.  If you select a key using B<-u> it has to be in
 139 this list.  B<REQUIRED>.
 140
 141 =head2 General settings
 142
 143 =item B<caffhome> [string]
 144
 145 Base directory for the files caff stores.  Default: B<$HOME/.caff/>.
 146
 147 =head2 GnuPG settings
 148
 149 =item B<gpg> [string]
 150
 151 Path to the GnuPG binary.  Default: B<gpg>.
 152
 153 =item B<gpg-sign> [string]
 154
 155 Path to the GnuPG binary which is used to sign keys.  Default: what
 156 B<gpg> is set to.
 157
 158 =item B<gpg-delsig> [string]
 159
 160 Path to the GnuPG binary which is used to split off signatures.  This was
 161 needed while the upstream GnuPG was not fixed.  Default: what B<gpg>
 162 is set to.
 163
 164 =item B<secret-keyring> [string]
 165
 166 Path to your secret keyring.  Default: B<$HOME/.gnupg/secring.gpg>.
 167
 168 =item B<also-encrypt-to> [keyid, or list of keyids]
 169
 170 Additional keyids to encrypt messages to. Default: none.
 171
 172 =item B<gpg-sign-args> [string]
 173
 174 Additional arguments to pass to gpg.  Default: none.
 175
 176 =head2 Keyserver settings
 177
 178 =item B<keyserver> [string]
 179
 180 Keyserver to download keys from.  Default: B<subkeys.pgp.net>.
 181
 182 =item B<no-download> [boolean]
 183
 184 If true, then skip the step of fetching keys from the keyserver.
 185 Default: B<0>.
 186
 187 =item B<key-files> [list of files]
 188
 189 A list of files containing keys to be imported.
 190
 191 =head2 Signing settings
 192
 193 =item B<no-sign> [boolean]
 194
 195 If true, then skip the signing step. Default: B<0>.
 196
 197 =item B<ask-sign> [boolean]
 198
 199 If true, then pause before continuing to the signing step.
 200 This is useful for offline signing. Default: B<0>.
 201
 202 =item B<export-sig-age> [seconds]
 203
 204 Don't export UIDs by default, on which your latest signature is older
 205 than this age.  Default: B<24*60*60> (i.e. one day).
 206
 207 =item B<local-user> [keyid, or list of keyids]
 208
 209 Select the key that is used for signing, in case you have more than one key.
 210 With multiple keyids, sign with each key in turn.
 211
 212 =head2 Mail settings
 213
 214 =item B<mail> [boolean]
 215
 216 Do not prompt for sending mail, just do it. Default: B<0>.
 217
 218 =item B<no-mail> [boolean]
 219
 220 Do not prompt for sending mail. The messages are still written to
 221 $CONFIG{caffhome}/keys/. Default: B<0>.
 222
 223 =item B<mail-template> [string]
 224
 225 Email template which is used as the body text for the email sent out
 226 instead of the default text if specified. The following perl variables
 227 can be used in the template:
 228
 229 =over
 230
 231 =item B<{owner}> [string]
 232
 233 Your name as specified in the L<B<owner>|/item_owner__5bstring_5d> setting.
 234
 235 =item B<{key}> [string]
 236
 237 The keyid of the key you signed.
 238
 239 =item B<{@uids}> [array]
 240
 241 The UIDs for which signatures are included in the mail.
 242
 243 =back
 244
 245 =item B<reply-to> [string]
 246
 247 Add a Reply-To: header to messages sent. Default: none.
 248
 249 =item B<bcc> [string]
 250
 251 Address to send blind carbon copies to when sending mail.
 252 Default: none.
 253
 254 =item B<mailer-send> [array]
 255
 256 Parameters to pass to Mail::Mailer.
 257 This could for example be
 258
 259         $CONFIG{mailer-send} =  [ 'smtp', Server => 'mail.server', Auth => ['user', 'pass'] ]
 260
 261 to use the perl SMTP client or
 262
 263         $CONFIG{mailer-send} =  [ 'sendmail', '-o8' ]
 264
 265 to pass arguments to the sendmail program.
 266 For more information run C<< perldoc Mail::Mailer >>.
 267 Setting this option is strongly discouraged.  Fix your local MTA
 268 instead.
 269 Default: none.
 270
 271 =back
 272
 273 =head1 AUTHORS
 274
 275 =over
 276
 277 =item Peter Palfrader <peter@palfrader.org>
 278
 279 =item Christoph Berg <cb@df7cb.de>
 280
 281 =back
 282
 283 =head1 WEBSITE
 284
 285 http://pgp-tools.alioth.debian.org/
 286
 287 =head1 SEE ALSO
 288
 289 gpg(1), pgp-clean(1), /usr/share/doc/signing-party/caff/caffrc.sample.
 290
 291 =cut
 292
 293 use strict;
 294 use IO::Handle;
 295 use English;
 296 use File::Path;
 297 use File::Temp qw{tempdir};
 298 use Text::Template;
 299 use MIME::Entity;
 300 use Fcntl;
 301 use IO::Select;
 302 use Getopt::Long;
 303 use GnuPG::Interface;
 304
 305 my %CONFIG;
 306 my $REVISION = '$Rev$';
 307 my ($REVISION_NUMER) = $REVISION =~ /(\d+)/;
 308 my $VERSION = "0.0.0.$REVISION_NUMER";
 309
 310
 311
 312 sub mywarn($) {
 313         my ($line) = @_;
 314         print "[WARN] $line\n";
 315 };
 316 sub notice($) {
 317         my ($line) = @_;
 318         print "[NOTICE] $line\n";
 319 };
 320 sub info($) {
 321         my ($line) = @_;
 322         print "[INFO] $line\n";
 323 };
 324 sub debug($) {
 325         my ($line) = @_;
 326         #print "[DEBUG] $line\n";
 327 };
 328 sub trace($) {
 329         my ($line) = @_;
 330         #print "[trace] $line\n";
 331 };
 332 sub trace2($) {
 333         my ($line) = @_;
 334         #print "[trace2] $line\n";
 335 };
 336
 337
 338 sub generate_config() {
 339         notice("Error: \$LOGNAME is not set.\n") unless defined $ENV{'LOGNAME'};
 340         my $gecos = defined $ENV{'LOGNAME'} ? (getpwnam($ENV{LOGNAME}))[6] : undef;
 341         my $email;
 342         my @keys;
 343         # BSD does not have hostname -f, so we try without -f first
 344         my $hostname = `hostname`;
 345         $hostname = `hostname -f` unless $hostname =~ /\./;
 346         chomp $hostname;
 347         my ($Cgecos,$Cemail,$Ckeys) = ('','','');
 348
 349         if (defined $gecos) {
 350                 $gecos =~ s/,.*//;
 351
 352                 my $gpg = GnuPG::Interface->new();
 353                 $gpg->call( 'gpg' );
 354                 $gpg->options->hash_init(
 355                         'extra_args' => [ qw{ --no-auto-check-trustdb --trust-model=always --with-colons --fixed-list-mode } ] );
 356                 $gpg->options->meta_interactive( 0 );
 357                 my ($inputfd, $stdoutfd, $stderrfd, $statusfd, $handles) = make_gpg_fds();
 358                 my $pid = $gpg->list_public_keys(handles => $handles, command_args => [ $gecos ]);
 359                 my ($stdout, $stderr, $status) = readwrite_gpg('', $inputfd, $stdoutfd, $stderrfd, $statusfd);
 360                 waitpid $pid, 0;
 361
 362                 if ($stdout eq '') {
 363                         warn ("No data from gpg for list-key\n"); # There should be at least 'tru:' everywhere.
 364                 };
 365
 366                 @keys = ($stdout =~ /^pub:[^r:]*:(?:[^:]*:){2,2}([^:]+):/mg);
 367                 unless (scalar @keys) {
 368                         info("Error: No keys were found using \"gpg --list-public-keys '$gecos'\".");
 369                         @keys = qw{0123456789abcdef 89abcdef76543210};
 370                         $Ckeys = '#';
 371                 }
 372                 ($email) =  ($stdout =~ /^uid:.*<(.+?@.+?)>.*:/m);
 373                 unless (defined $email) {
 374                         info("Error: No email address was found using \"gpg --list-public-keys '$gecos'\".");
 375                         $email = $ENV{'LOGNAME'}.'@'.$hostname;
 376                         $Cemail = '#';
 377                 }
 378         } else {
 379                 $gecos = 'Unknown Caff User';
 380                 $email = $ENV{'LOGNAME'}.'@'.$hostname;
 381                 @keys = qw{0123456789abcdef 89abcdef76543210};
 382                 ($Cgecos,$Cemail,$Ckeys) = ('#','#','#');
 383         };
 384
 385         my $template = <<EOT;
 386 # .caffrc -- vim:ft=perl:
 387 # This file is in perl(1) format - see caff(1) for details.
 388
 389 $Cgecos\$CONFIG{'owner'} = '$gecos';
 390 $Cemail\$CONFIG{'email'} = '$email';
 391 #\$CONFIG{'reply-to'} = 'foo\@bla.org';
 392
 393 # You can get your long keyid from
 394 #   gpg --with-colons --list-key <yourkeyid|name|emailaddress..>
 395 #
 396 # If you have a v4 key, it will simply be the last 16 digits of
 397 # your fingerprint.
 398 #
 399 # Example:
 400 #   \$CONFIG{'keyid'} = [ qw{FEDCBA9876543210} ];
 401 #  or, if you have more than one key:
 402 #   \$CONFIG{'keyid'} = [ qw{0123456789ABCDEF 89ABCDEF76543210} ];
 403 $Ckeys\$CONFIG{'keyid'} = [ qw{@keys} ];
 404
 405 # Select this/these keys to sign with
 406 #\$CONFIG{'local-user'} = [ qw{@keys} ];
 407
 408 # Additionally encrypt messages for these keyids
 409 #\$CONFIG{'also-encrypt-to'} = [ qw{@keys} ];
 410
 411 # Mail template to use for the encrypted part
 412 #\$CONFIG{'mail-template'} = << 'EOM';
 413 EOT
 414
 415         $template .= "#$_" foreach <DATA>;
 416         $template .= "#EOM\n";
 417         return $template;
 418 };
 419
 420 sub check_executable($$) {
 421         # (GnuPG::Interface gives lousy errors when the gpg binary isn't found,
 422         # so we want to check manually.)
 423         my ($purpose, $fn) = @_;
 424         # Only check provided fnames with a slash in them.
 425         return unless defined $fn;
 426         if ($fn =~ m!/!) {
 427                 die ("$PROGRAM_NAME: $purpose executable '$fn' not found.\n") unless -x $fn;
 428         } else {
 429                 for my $p (split(':', $ENV{PATH})) {
 430                         return if -x "$p/$fn";
 431                 };
 432                 die ("$PROGRAM_NAME: $purpose executable '$fn' not found on path.\n") unless -x $fn;
 433         };
 434 };
 435
 436 sub load_config() {
 437         my $config = $ENV{'HOME'} . '/.caffrc';
 438         unless (-f $config) {
 439                 print "No configfile $config present, I will use this template:\n";
 440                 my $template = generate_config();
 441                 print "$template\nPlease edit $config and run caff again.\n";
 442                 open F, ">$config" or die "$config: $!";
 443                 print F $template;
 444                 close F;
 445                 exit(1);
 446         }
 447         unless (scalar eval `cat $config`) {
 448                 die "Couldn't parse $config: $EVAL_ERROR\n" if $EVAL_ERROR;
 449         };
 450
 451         $CONFIG{'caffhome'}=$ENV{'HOME'}.'/.caff' unless defined $CONFIG{'caffhome'};
 452         die ("$PROGRAM_NAME: owner is not defined in $config.\n") unless defined $CONFIG{'owner'};
 453         die ("$PROGRAM_NAME: email is not defined in $config.\n") unless defined $CONFIG{'email'};
 454         die ("$PROGRAM_NAME: keyid is not defined in $config.\n") unless defined $CONFIG{'keyid'};
 455         die ("$PROGRAM_NAME: keyid is not an array ref in $config.\n") unless (ref $CONFIG{'keyid'} eq 'ARRAY');
 456         for my $keyid (@{$CONFIG{'keyid'}}) {
 457                 $keyid =~ /^[A-F0-9]{16}$/i or die ("$PROGRAM_NAME: key $keyid is not a long (16 digit) keyid in $config.\n");
 458         };
 459         @{$CONFIG{'keyid'}} = map { uc } @{$CONFIG{'keyid'}};
 460         $CONFIG{'export-sig-age'}= 24*60*60 unless defined $CONFIG{'export-sig-age'};
 461         $CONFIG{'keyserver'} = 'subkeys.pgp.net' unless defined $CONFIG{'keyserver'};
 462         $CONFIG{'gpg'} = 'gpg' unless defined $CONFIG{'gpg'};
 463         $CONFIG{'gpg-sign'} = $CONFIG{'gpg'} unless defined $CONFIG{'gpg-sign'};
 464         $CONFIG{'gpg-delsig'} = $CONFIG{'gpg'} unless defined $CONFIG{'gpg-delsig'};
 465         check_executable("gpg", $CONFIG{'gpg'});
 466         check_executable("gpg-sign", $CONFIG{'gpg-sign'});
 467         check_executable("gpg-delsig", $CONFIG{'gpg-delsig'});
 468         $CONFIG{'secret-keyring'} = $ENV{'HOME'}.'/.gnupg/secring.gpg' unless defined $CONFIG{'secret-keyring'};
 469         $CONFIG{'no-download'} = 0 unless defined $CONFIG{'no-download'};
 470         $CONFIG{'no-sign'} = 0 unless defined $CONFIG{'no-sign'};
 471         $CONFIG{'key-files'} = () unless defined $CONFIG{'key-files'};
 472         $CONFIG{'mailer-send'} = [] unless defined $CONFIG{'mailer-send'};
 473         die ("$PROGRAM_NAME: mailer-send is not an array ref in $config.\n") unless (ref $CONFIG{'mailer-send'} eq 'ARRAY');
 474         unless (defined $CONFIG{'mail-template'}) {
 475                 $CONFIG{'mail-template'} .= $_ foreach <DATA>;
 476         }
 477 };
 478
 479 sub make_gpg_fds() {
 480         my %fds = (
 481                 stdin => IO::Handle->new(),
 482                 stdout => IO::Handle->new(),
 483                 stderr => IO::Handle->new(),
 484                 status => IO::Handle->new() );
 485         my $handles = GnuPG::Handles->new( %fds );
 486         return ($fds{'stdin'}, $fds{'stdout'}, $fds{'stderr'}, $fds{'status'}, $handles);
 487 };
 488
 489 sub readwrite_gpg($$$$$%) {
 490         my ($in, $inputfd, $stdoutfd, $stderrfd, $statusfd, %options) = @_;
 491
 492         trace("Entering readwrite_gpg.");
 493
 494         my ($first_line, undef) = split /\n/, $in;
 495         debug("readwrite_gpg sends ".(defined $first_line ? $first_line : "<nothing>"));
 496
 497         local $INPUT_RECORD_SEPARATOR = undef;
 498         my $sout = IO::Select->new();
 499         my $sin = IO::Select->new();
 500         my $offset = 0;
 501
 502         trace("input is $inputfd; output is $stdoutfd; err is $stderrfd; status is ".(defined $statusfd ? $statusfd : 'undef').".");
 503
 504         $inputfd->blocking(0);
 505         $stdoutfd->blocking(0);
 506         $statusfd->blocking(0) if defined $statusfd;
 507         $stderrfd->blocking(0);
 508         $sout->add($stdoutfd);
 509         $sout->add($stderrfd);
 510         $sout->add($statusfd) if defined $statusfd;
 511         $sin->add($inputfd);
 512
 513         my ($stdout, $stderr, $status) = ("", "", "");
 514         my $exitwhenstatusmatches = $options{'exitwhenstatusmatches'};
 515         trace("doing stuff until we find $exitwhenstatusmatches") if defined $exitwhenstatusmatches;
 516
 517         my $readwrote_stuff_this_time = 0;
 518         my $do_not_wait_on_select = 0;
 519         my ($readyr, $readyw, $written);
 520         while ($sout->count() > 0 || (defined($sin) && ($sin->count() > 0))) {
 521                 if (defined $exitwhenstatusmatches) {
 522                         if ($status =~ /$exitwhenstatusmatches/m) {
 523                                 trace("readwrite_gpg found match on $exitwhenstatusmatches");
 524                                 if ($readwrote_stuff_this_time) {
 525                                         trace("read/write some more\n");
 526                                         $do_not_wait_on_select = 1;
 527                                 } else {
 528                                         trace("that's it in our while loop.\n");
 529                                         last;
 530                                 }
 531                         };
 532                 };
 533
 534                 $readwrote_stuff_this_time = 0;
 535                 trace("select waiting for ".($sout->count())." fds.");
 536                 ($readyr, $readyw, undef) = IO::Select::select($sout, $sin, undef, $do_not_wait_on_select ? 0 : 1);
 537                 trace("ready: write: ".(defined $readyw ? scalar @$readyw : 0 )."; read: ".(defined $readyr ? scalar @$readyr : 0));
 538                 for my $wfd (@$readyw) {
 539                         $readwrote_stuff_this_time = 1;
 540                         if (length($in) != $offset) {
 541                                 trace("writing to $wfd.");
 542                                 $written = $wfd->syswrite($in, length($in) - $offset, $offset);
 543                                 $offset += $written;
 544                         };
 545                         if ($offset == length($in)) {
 546                                 trace("writing to $wfd done.");
 547                                 unless ($options{'nocloseinput'}) {
 548                                         close $wfd;
 549                                         trace("$wfd closed.");
 550                                 };
 551                                 $sin->remove($wfd);
 552                                 $sin = undef;
 553                         }
 554                 }
 555
 556                 next unless (defined(@$readyr)); # Wait some more.
 557
 558                 for my $rfd (@$readyr) {
 559                         $readwrote_stuff_this_time = 1;
 560                         if ($rfd->eof) {
 561                                 trace("reading from $rfd done.");
 562                                 $sout->remove($rfd);
 563                                 close($rfd);
 564                                 next;
 565                         }
 566                         trace("reading from $rfd.");
 567                         if ($rfd == $stdoutfd) {
 568                                 $stdout .= <$rfd>;
 569                                 trace2("stdout is now $stdout\n================");
 570                                 next;
 571                         }
 572                         if (defined $statusfd && $rfd == $statusfd) {
 573                                 $status .= <$rfd>;
 574                                 trace2("status is now $status\n================");
 575                                 next;
 576                         }
 577                         if ($rfd == $stderrfd) {
 578                                 $stderr .= <$rfd>;
 579                                 trace2("stderr is now $stderr\n================");
 580                                 next;
 581                         }
 582                 }
 583         }
 584         trace("readwrite_gpg done.");
 585         return ($stdout, $stderr, $status);
 586 };
 587
 588 sub ask($$;$$) {
 589         my ($question, $default, $forceyes, $forceno) = @_;
 590         my $answer;
 591         my $yn = $default ? '[Y/n]' : '[y/N]';
 592         while (1) {
 593                 print $question,' ',$yn, ' ';
 594                 if ($forceyes && $forceno) {
 595                         print "$default (from config/command line)\n";
 596                         return $default;
 597                 };
 598                 if ($forceyes) {
 599                         print "YES (from config/command line)\n";
 600                         return 1;
 601                 };
 602                 if ($forceno) {
 603                         print "NO (from config/command line)\n";
 604                         return 0;
 605                 };
 606
 607                 $answer = <STDIN>;
 608                 if (!defined $answer) {
 609                         $OUTPUT_AUTOFLUSH = 1;
 610                         die "\n\n".
 611                             "End of STDIN reached.  Are you using xargs?  Caff wants to read from STDIN,\n".
 612                             "so you can't really use it with xargs.  A patch against caff to read from\n".
 613                             "the terminal would be appreciated.\n".
 614                             "For now instead of   cat keys | xargs caff  do  caff `cat keys`\n";
 615                 };
 616                 chomp $answer;
 617                 last if ((length $answer == 0) || ($answer =~ m/^[yYnN]$/) );
 618                 print "What about $yn is so hard to understand?\nAnswer with either 'n' or 'y' or just press enter for the default.\n";
 619                 sleep 1;
 620         };
 621         my $result = $default;
 622         $result = 1 if $answer =~ /y/i;
 623         $result = 0 if $answer =~ /n/i;
 624         return $result;
 625 };
 626
 627
 628
 629
 630
 631 my $KEYEDIT_PROMPT = '^\[GNUPG:\] GET_LINE keyedit.prompt';
 632 my $KEYEDIT_DELUID_PROMPT = '^\[GNUPG:\] GET_BOOL keyedit.remove.uid.okay';
 633 my $KEYEDIT_DELSIG_PROMPT = '^\[GNUPG:\] GET_BOOL keyedit.delsig';
 634 my $KEYEDIT_KEYEDIT_OR_DELSIG_PROMPT = '^\[GNUPG:\] (GET_BOOL keyedit.delsig|GET_LINE keyedit.prompt)';
 635 my $KEYEDIT_DELSUBKEY_PROMPT = '^\[GNUPG:\] GET_BOOL keyedit.remove.subkey';
 636
 637 load_config;
 638 my $USER_AGENT = "caff $VERSION - http://pgp-tools.alioth.debian.org/";
 639
 640 my $KEYSBASE =  $CONFIG{'caffhome'}.'/keys';
 641 my $GNUPGHOME = $CONFIG{'caffhome'}.'/gnupghome';
 642
 643 -d $KEYSBASE  || mkpath($KEYSBASE , 0, 0700) or die ("Cannot create $KEYSBASE: $!\n");
 644 -d $GNUPGHOME || mkpath($GNUPGHOME, 0, 0700) or die ("Cannot create $GNUPGHOME: $!\n");
 645
 646 my $NOW = time;
 647 my  ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($NOW);
 648 my $DATE_STRING = sprintf("%04d-%02d-%02d", $year+1900, $mon+1, $mday);
 649
 650
 651 sub version($) {
 652         my ($fd) = @_;
 653         print $fd "caff $VERSION - (c) 2004, 2005, 2006 Peter Palfrader et al.\n";
 654 };
 655
 656 sub usage($$) {
 657         my ($fd, $exitcode) = @_;
 658         version($fd);
 659         print $fd "Usage: $PROGRAM_NAME [-eEmMRS] [-u <yourkeyid>] <keyid> [<keyid> ...]\n";
 660         print $fd "Consult the manual page for more information.\n";
 661         exit $exitcode;
 662 };
 663
 664 ######
 665 # export key $keyid from $gnupghome
 666 ######
 667 sub export_key($$) {
 668         my ($gnupghome, $keyid) = @_;
 669
 670         my $gpg = GnuPG::Interface->new();
 671         $gpg->call( $CONFIG{'gpg'} );
 672         if (defined $gnupghome) {
 673                 $gpg->options->hash_init(
 674                         'homedir' => $gnupghome,
 675                         'extra_args' => [ qw{ --no-auto-check-trustdb --trust-model=always } ],
 676                         'armor' => 1 );
 677         } else {
 678                 $gpg->options->hash_init(
 679                         'extra_args' => [ qw{ --no-auto-check-trustdb --trust-model=always } ],
 680                         'armor' => 1 );
 681         };
 682         $gpg->options->meta_interactive( 0 );
 683         my ($inputfd, $stdoutfd, $stderrfd, $statusfd, $handles) = make_gpg_fds();
 684         my $pid = $gpg->export_keys(handles => $handles, command_args => [ $keyid ]);
 685         my ($stdout, $stderr, $status) = readwrite_gpg('', $inputfd, $stdoutfd, $stderrfd, $statusfd);
 686         waitpid $pid, 0;
 687
 688         return $stdout;
 689 };
 690
 691 ######
 692 # import a key from the scalar $asciikey into a gpg homedirectory in $tempdir
 693 ######
 694 sub import_key($$) {
 695         my ($gnupghome, $asciikey) = @_;
 696
 697         my $gpg = GnuPG::Interface->new();
 698         $gpg->call( $CONFIG{'gpg'} );
 699         $gpg->options->hash_init(
 700                 'homedir' => $gnupghome,
 701                 'extra_args' => [ qw{ --no-auto-check-trustdb --trust-model=always } ] );
 702         $gpg->options->meta_interactive( 0 );
 703         my ($inputfd, $stdoutfd, $stderrfd, $statusfd, $handles) = make_gpg_fds();
 704         my $pid = $gpg->import_keys(handles => $handles);
 705         my ($stdout, $stderr, $status) = readwrite_gpg($asciikey, $inputfd, $stdoutfd, $stderrfd, $statusfd);
 706         waitpid $pid, 0;
 707
 708         if ($status !~ /^\[GNUPG:\] IMPORT_OK/m) {
 709                 return undef;
 710         };
 711         return 1;
 712 };
 713
 714
 715 ######
 716 # Send an email to $address.  If $can_encrypt is true then the mail
 717 # will be PGP/MIME encrypted to $longkeyid.
 718 #
 719 # $longkeyid, $uid, and @attached will be used in the email and the template.
 720 ######
 721 #send_mail($address, $can_encrypt, $longkeyid, $uid, @attached);
 722 sub send_mail($$$@) {
 723         my ($address, $can_encrypt, $key_id, @keys) = @_;
 724
 725         my $template = Text::Template->new(TYPE => 'STRING', SOURCE => $CONFIG{'mail-template'})
 726             or die "Error creating template: $Text::Template::ERROR";
 727
 728         my @uids;
 729         for my $key (@keys) {
 730             push @uids, $key->{'text'};
 731         };
 732         my $message = $template->fill_in(HASH => { key => $key_id,
 733                                                    uids => \@uids,
 734                                                    owner => $CONFIG{'owner'}})
 735             or die "Error filling template in: $Text::Template::ERROR";
 736
 737         my $message_entity = MIME::Entity->build(
 738                 Type        => "text/plain",
 739                 Charset     => "utf-8",
 740                 Disposition => 'inline',
 741                 Data        => $message);
 742
 743         my @key_entities;
 744         for my $key (@keys) {
 745                 $message_entity->attach(
 746                         Type        => "application/pgp-keys",
 747                         Disposition => 'attachment',
 748                         Encoding    => "7bit",
 749                         Description => "PGP Key 0x$key_id, uid ".($key->{'text'}).' ('.($key->{'serial'}).'), signed by 0x'.$CONFIG{'keyid'}[0],
 750                         Data        => $key->{'key'},
 751                         Filename    => "0x$key_id.".$key->{'serial'}.".signed-by-0x".$CONFIG{'keyid'}[0].".asc");
 752         };
 753
 754         if ($can_encrypt) {
 755                 my $message = $message_entity->stringify();
 756
 757                 my $gpg = GnuPG::Interface->new();
 758                 $gpg->call( $CONFIG{'gpg'} );
 759                 $gpg->options->hash_init( 'homedir' => $GNUPGHOME,
 760                         'extra_args' => [ qw{ --no-auto-check-trustdb --trust-model=always } ],
 761                         'armor' => 1 );
 762                 $gpg->options->meta_interactive( 0 );
 763                 my ($inputfd, $stdoutfd, $stderrfd, $statusfd, $handles) = make_gpg_fds();
 764                 $gpg->options->push_recipients( $key_id );
 765                 if (defined $CONFIG{'also-encrypt-to'}) {
 766                         if (ref($CONFIG{'also-encrypt-to'})) {
 767                                 $gpg->options->push_recipients($_)
 768                                         foreach @{$CONFIG{'also-encrypt-to'}};
 769                         } else {
 770                                 $gpg->options->push_recipients($CONFIG{'also-encrypt-to'});
 771                         }
 772                 }
 773                 my $pid = $gpg->encrypt(handles => $handles);
 774                 my ($stdout, $stderr, $status) = readwrite_gpg($message, $inputfd, $stdoutfd, $stderrfd, $statusfd);
 775                 waitpid $pid, 0;
 776                 if ($stdout eq '') {
 777                         warn ("No data from gpg for list-key $key_id\n");
 778                         next;
 779                 };
 780                 $message = $stdout;
 781
 782                 $message_entity = MIME::Entity->build(
 783                         Type        => 'multipart/encrypted; protocol="application/pgp-encrypted"',
 784                         Encoding    => '7bit');
 785
 786                 $message_entity->attach(
 787                         Type        => "application/pgp-encrypted",
 788                         Disposition => 'attachment',
 789                         Encoding    => "7bit",
 790                         Data        => "Version: 1\n");
 791
 792                 $message_entity->attach(
 793                         Type        => "application/octet-stream",
 794                         Filename    => 'msg.asc',
 795                         Disposition => 'inline',
 796                         Encoding    => "7bit",
 797                         Data        => $message);
 798         };
 799
 800         $message_entity->head->add("Subject", "Your signed PGP key 0x$key_id");
 801         $message_entity->head->add("To", $address);
 802         $message_entity->head->add("From", '"'.$CONFIG{'owner'}.'" <'.$CONFIG{'email'}.'>');
 803         $message_entity->head->add("Reply-To", $CONFIG{'reply-to'}) if defined $CONFIG{'reply-to'};
 804         $message_entity->head->add("Bcc", $CONFIG{'bcc'}) if defined $CONFIG{'bcc'};
 805         $message_entity->head->add("User-Agent", $USER_AGENT);
 806         mywarn("You have set arguments to pass to Mail::Mailer.  Better fix your MTA.  (Also, Mail::Mailer's error reporting is non existant, so it won't tell you when it doesn't work.)") if (scalar @{$CONFIG{'mailer-send'}} > 0);
 807         $message_entity->send(@{$CONFIG{'mailer-send'}});
 808         $message_entity->stringify();
 809 };
 810
 811 ######
 812 # clean up a UID so that it can be used on the FS.
 813 ######
 814 sub sanitize_uid($) {
 815         my ($uid) = @_;
 816
 817         my $good_uid = $uid;
 818         $good_uid =~ tr#/:\\#_#;
 819         trace2("[sanitize_uid] changed UID from $uid to $good_uid.\n") if $good_uid ne $uid;
 820         return $good_uid;
 821 };
 822
 823 sub delete_signatures($$$$$$) {
 824         my ($inputfd, $stdoutfd, $stderrfd, $statusfd, $longkeyid, $keyids) =@_;
 825
 826         my $signed_by_me = 0;
 827
 828         my ($stdout, $stderr, $status) =
 829                 readwrite_gpg("delsig\n", $inputfd, $stdoutfd, $stderrfd, $statusfd, exitwhenstatusmatches => $KEYEDIT_DELSIG_PROMPT, nocloseinput => 1);
 830
 831         while($status =~ /$KEYEDIT_DELSIG_PROMPT/m) {
 832                 # sig:?::17:EA2199412477CAF8:1058095214:::::13x:
 833                 my @sigline = grep { /^sig/ } (split /\n/, $stdout);
 834                 $stdout =~ s/\n/\\n/g;
 835                 notice("[sigremoval] why are there ".(scalar @sigline)." siglines in that part of the dialog!? got: $stdout") if scalar @sigline >= 2; # XXX
 836                 my $line = pop @sigline;
 837                 my $answer = "no";
 838                 if (defined $line) { # only if we found a sig here - we never remove revocation packets for instance
 839                         debug("[sigremoval] doing line $line.");
 840                         my (undef, undef, undef, undef, $signer, $created, undef, undef, undef) = split /:/, $line;
 841                         if ($signer eq $longkeyid) {
 842                                 debug("[sigremoval] selfsig ($signer).");
 843                                 $answer = "no";
 844                         } elsif (grep { $signer eq $_ } @{$keyids}) {
 845                                 debug("[sigremoval] signed by us ($signer).");
 846                                 $answer = "no";
 847                                 $signed_by_me = $signed_by_me > $created ? $signed_by_me : $created;
 848                         } else {
 849                                 debug("[sigremoval] not interested in that sig ($signer).");
 850                                 $answer = "yes";
 851                         };
 852                 } else {
 853                         debug("[sigremoval] no sig line here, only got: ".$stdout);
 854                 };
 855                 ($stdout, $stderr, $status) =
 856                         readwrite_gpg($answer."\n", $inputfd, $stdoutfd, $stderrfd, $statusfd, exitwhenstatusmatches => $KEYEDIT_KEYEDIT_OR_DELSIG_PROMPT, nocloseinput => 1);
 857         };
 858
 859         return $signed_by_me;
 860 };
 861
 862
 863 ###################
 864 # argument handling
 865 ###################
 866 my @KEYIDS;
 867 my $params;
 868
 869 Getopt::Long::config('bundling');
 870 if (!GetOptions (
 871         '-h'              =>  \$params->{'help'},
 872         '--help'          =>  \$params->{'help'},
 873         '--version'       =>  \$params->{'version'},
 874         '-V'              =>  \$params->{'version'},
 875         '-u=s'            =>  \$params->{'local-user'},
 876         '--local-user=s'  =>  \$params->{'local-user'},
 877         '-e'              =>  \$params->{'export-old'},
 878         '--export-old'    =>  \$params->{'export-old'},
 879         '-E'              =>  \$params->{'no-export-old'},
 880         '--no-export-old' =>  \$params->{'no-export-old'},
 881         '-m'              =>  \$params->{'mail'},
 882         '--mail'          =>  \$params->{'mail'},
 883         '-M'              =>  \$params->{'no-mail'},
 884         '--no-mail'       =>  \$params->{'no-mail'},
 885         '-R'              =>  \$params->{'no-download'},
 886         '--no-download'   =>  \$params->{'no-download'},
 887         '-S'              =>  \$params->{'no-sign'},
 888         '--no-sign'       =>  \$params->{'no-sign'},
 889         '--key-file=s@'   =>  \$params->{'key-files'},
 890         )) {
 891         usage(\*STDERR, 1);
 892 };
 893 if ($params->{'help'}) {
 894         usage(\*STDOUT, 0);
 895 };
 896 if ($params->{'version'}) {
 897         version(\*STDOUT);
 898         exit(0);
 899 };
 900 usage(\*STDERR, 1) unless scalar @ARGV >= 1;
 901
 902 $CONFIG{'local-user'}  = $params->{'local-user'}  if defined $params->{'local-user'};
 903 $CONFIG{'no-download'} = $params->{'no-download'} if defined $params->{'no-download'};
 904 $CONFIG{'no-mail'}     = $params->{'no-mail'}     if defined $params->{'no-mail'};
 905 $CONFIG{'mail'}        = $params->{'mail'}        if defined $params->{'mail'};
 906 $CONFIG{'no-sign'}     = $params->{'no-sign'}     if defined $params->{'no-sign'};
 907 push @{$CONFIG{'key-files'}}, @{$params->{'key-files'}} if defined $params->{'key-files'};
 908
 909 for my $keyid (@ARGV) {
 910         $keyid =~ s/^0x//i;
 911         if ($keyid =~ /^[A-F0-9]{32}$/i) {
 912                 info("Ignoring v3 fingerprint $keyid.  v3 keys are obsolete.");
 913                 next;
 914         };
 915         if ($keyid !~ /^([A-F0-9]{8}|[A-F0-9]{16}|[A-F0-9]{40})$/i) {
 916                 print STDERR "$keyid is not a keyid.\n";
 917                 usage(\*STDERR, 1);
 918         };
 919         push @KEYIDS, uc($keyid);
 920 };
 921
 922 #################
 923 # import own keys
 924 #################
 925 for my $keyid (@{$CONFIG{'keyid'}}) {
 926         my $gpg = GnuPG::Interface->new();
 927         $gpg->call( $CONFIG{'gpg'} );
 928         $gpg->options->hash_init(
 929                 'homedir' => $GNUPGHOME,
 930                 'extra_args' => [ qw{ --no-auto-check-trustdb --trust-model=always --with-colons --fixed-list-mode --fast-list-mode } ] );
 931         $gpg->options->meta_interactive( 0 );
 932         my ($inputfd, $stdoutfd, $stderrfd, $statusfd, $handles) = make_gpg_fds();
 933         my $pid = $gpg->list_public_keys(handles => $handles, command_args => $keyid);
 934         my ($stdout, $stderr, $status) = readwrite_gpg('', $inputfd, $stdoutfd, $stderrfd, $statusfd);
 935         waitpid $pid, 0;
 936
 937         if ($stdout eq '') {
 938                 warn ("No data from gpg for list-key\n"); # There should be at least 'tru:' everywhere.
 939         };
 940         unless ($stdout =~ /^pub:(?:[^:]*:){3,3}$keyid:/m) {
 941                 info("Key $keyid not found in caff's home.  Getting it from your normal GnuPGHome.");
 942                 my $key = export_key(undef, $keyid);
 943                 if (!defined $key || $key eq '') {
 944                         warn ("Did not get key $keyid from your normal GnuPGHome\n");
 945                         next;
 946                 };
 947                 my $result = import_key($GNUPGHOME, $key);
 948                 unless ($result) {
 949                         warn ("Could not import $keyid into caff's gnupghome.\n");
 950                         next;
 951                 };
 952         }
 953 }
 954
 955 ########################
 956 # import keys from files
 957 ########################
 958 foreach my $keyfile (@{$CONFIG{'key-files'}}) {
 959     my $gpg = GnuPG::Interface->new();
 960     $gpg->call( $CONFIG{'gpg'} );
 961     $gpg->options->hash_init('homedir' => $GNUPGHOME);
 962     $gpg->options->meta_interactive( 0 );
 963     my ($inputfd, $stdoutfd, $stderrfd, $statusfd, $handles) = make_gpg_fds();
 964     my $pid = $gpg->import_keys(handles => $handles, command_args => $keyfile);
 965     my ($stdout, $stderr, $status) = readwrite_gpg('', $inputfd, $stdoutfd, $stderrfd, $statusfd);
 966     info ("Importing keys from $keyfile");
 967     waitpid $pid, 0;
 968     if ($status !~ /^\[GNUPG:\] IMPORT_OK/m) {
 969         warn $stderr;
 970     }
 971 }
 972
 973 #############################
 974 # receive keys from keyserver
 975 #############################
 976 my @keyids_ok;
 977 if ($CONFIG{'no-download'}) {
 978         @keyids_ok = @KEYIDS;
 979 } else {
 980         info ("fetching keys, this will take a while...");
 981
 982         my $gpg = GnuPG::Interface->new();
 983         $gpg->call( $CONFIG{'gpg'} );
 984         $gpg->options->hash_init(
 985                 'homedir' => $GNUPGHOME,
 986                 'extra_args' => [ qw{ --no-auto-check-trustdb --trust-model=always }, '--keyserver='.$CONFIG{'keyserver'} ] );
 987         $gpg->options->meta_interactive( 0 );
 988         my ($inputfd, $stdoutfd, $stderrfd, $statusfd, $handles) = make_gpg_fds();
 989         my $pid = $gpg->recv_keys(handles => $handles, command_args => [ @KEYIDS ]);
 990         my ($stdout, $stderr, $status) = readwrite_gpg('', $inputfd, $stdoutfd, $stderrfd, $statusfd);
 991         waitpid $pid, 0;
 992
 993 # [GNUPG:] IMPORT_OK 0 5B00C96D5D54AEE1206BAF84DE7AAF6E94C09C7F
 994 # [GNUPG:] NODATA 1
 995 # [GNUPG:] NODATA 1
 996 # [GNUPG:] IMPORT_OK 0 25FC1614B8F87B52FF2F99B962AF4031C82E0039
 997         my %local_keyids = map { $_ => 1 } @KEYIDS;
 998         my $had_v3_keys = 0;
 999         for my $line (split /\n/, $status) {
1000                 if ($line =~ /^\[GNUPG:\] IMPORT_OK \d+ ([0-9A-F]{40})/) {
1001                         my $imported_key = $1;
1002                         my $whole_fpr = $imported_key;
1003                         my $long_keyid = substr($imported_key, -16);
1004                         my $short_keyid = substr($imported_key, -8);
1005                         my $speced_key;
1006                         for my $spec (($whole_fpr, $long_keyid, $short_keyid)) {
1007                                 $speced_key = $spec if $local_keyids{$spec};
1008                         };
1009                         unless ($speced_key) {
1010                             notice ("Imported unexpected key; got: $imported_key\n");
1011                             next;
1012                         };
1013                         debug ("Imported $imported_key for $speced_key");
1014                         delete $local_keyids{$speced_key};
1015                         unshift @keyids_ok, $imported_key;
1016                 } elsif ($line =~ /^\[GNUPG:\] (NODATA|IMPORT_RES|IMPORTED) /) {
1017                 } elsif ($line =~ /^\[GNUPG:\] IMPORT_OK \d+ ([0-9A-F]{32})/) {
1018                         my $imported_key = $1;
1019                         notice ("Imported key $1 is a version 3 key.  Version 3 keys are obsolete, should not be used, and are not and will not be properly supported.");
1020                         $had_v3_keys = 1;
1021                 } else {
1022                         notice ("got unknown reply from gpg: $line");
1023                 }
1024         };
1025         if (scalar %local_keyids) {
1026                 notice ("Import failed for: ". (join ' ', keys %local_keyids)."." . ($had_v3_keys ? " (Or maybe it's one of those ugly v3 keys?)" :  ""));
1027                 exit 1 unless ask ("Some keys could not be imported - continue anyway?", 0);
1028                 if (scalar %local_keyids == 1) {
1029                         mywarn("Assuming ". (join ' ', keys %local_keyids)." is a fine keyid.");
1030                 } else {
1031                         mywarn("Assuming ". (join ' ', keys %local_keyids)." are fine keyids.");
1032                 };
1033                 push @keyids_ok, keys %local_keyids;
1034         }
1035 };
1036
1037 unless (@keyids_ok) {
1038         notice ("No keys to sign found");
1039         exit 0;
1040 }
1041
1042 ###########
1043 # sign keys
1044 ###########
1045 if ($CONFIG{'ask-sign'} && ! $CONFIG{'no-sign'}) {
1046         $CONFIG{'no-sign'} = ! ask("Continue with signing?", 1);
1047 }
1048
1049 unless ($CONFIG{'no-sign'}) {
1050         my @local_user;
1051         if ($CONFIG{'local-user'}) {
1052                 if (ref($CONFIG{'local-user'})) {
1053                         @local_user = @{$CONFIG{'local-user'}};
1054                 } else {
1055                         @local_user = split /\s*,\s*/, $CONFIG{'local-user'};
1056                 };
1057                 foreach (@local_user) {
1058                         s/^0x//i;
1059                         unless (/^([A-F0-9]{8}|[A-F0-9]{16}|[A-F0-9]{40})$/i) {
1060                                 print STDERR "Local-user $_ is not a keyid.\n";
1061                                 usage(\*STDERR, 1);
1062                         };
1063                         $_ = uc($_);
1064                 };
1065         } else {
1066                 @local_user = (undef);
1067         };
1068
1069         info("Sign the following keys according to your policy, then exit gpg with 'save' after signing each key");
1070         for my $keyid (@keyids_ok) {
1071                 foreach my $local_user (@local_user) {
1072                         my @command;
1073                         push @command, $CONFIG{'gpg-sign'};
1074                         push @command, '--local-user', $local_user if (defined $local_user);
1075                         push @command, "--homedir=$GNUPGHOME";
1076                         push @command, '--secret-keyring', $CONFIG{'secret-keyring'};
1077                         push @command, '--no-auto-check-trustdb';
1078                         push @command, '--trust-model=always';
1079                         push @command, '--edit', $keyid;
1080                         push @command, 'sign';
1081                         push @command, split ' ', $CONFIG{'gpg-sign-args'} || "";
1082                         print join(' ', @command),"\n";
1083                         system (@command);
1084                 };
1085         };
1086 };
1087
1088 ##################
1089 # export and prune
1090 ##################
1091 KEYS:
1092 for my $keyid (@keyids_ok) {
1093         # get key listing
1094         #################
1095         my $gpg = GnuPG::Interface->new();
1096         $gpg->call( $CONFIG{'gpg'} );
1097         $gpg->options->hash_init(
1098                 'homedir' => $GNUPGHOME,
1099                 'extra_args' => [ qw{ --no-auto-check-trustdb --trust-model=always --with-colons --fixed-list-mode } ] );
1100         $gpg->options->meta_interactive( 0 );
1101         my ($inputfd, $stdoutfd, $stderrfd, $statusfd, $handles) = make_gpg_fds();
1102         my $pid = $gpg->list_public_keys(handles => $handles, command_args => [ $keyid ]);
1103         my ($stdout, $stderr, $status) = readwrite_gpg('', $inputfd, $stdoutfd, $stderrfd, $statusfd);
1104         waitpid $pid, 0;
1105         if ($stdout eq '') {
1106                 warn ("No data from gpg for list-key $keyid\n");
1107                 next;
1108         };
1109         my @publine = grep { /^pub/ } (split /\n/, $stdout);
1110         if (scalar @publine == 0) {
1111                 warn ("No public keys found with list-key $keyid (note that caff uses its own keyring in $GNUPGHOME).\n");
1112                 next;
1113         };
1114         my (undef, undef, undef, undef, $longkeyid, undef, undef, undef, undef, undef, undef, $flags) = split /:/, pop @publine;
1115         if (scalar @publine > 0) {
1116                 warn ("More than one key matched $keyid.  Try to specify the long keyid or fingerprint\n");
1117                 next;
1118         };
1119         unless (defined $longkeyid) {
1120                 warn ("Didn't find public keyid in --list-key of key $keyid.\n");
1121                 next;
1122         };
1123         unless (defined $flags) {
1124                 warn ("Didn't find flags in --list-key of key $keyid.\n");
1125                 next;
1126         };
1127         my $can_encrypt = $flags =~ /E/;
1128
1129         # export the key
1130         ################
1131         my $asciikey = export_key($GNUPGHOME, $keyid);
1132         if ($asciikey eq '') {
1133                 warn ("No data from gpg for export $keyid\n");
1134                 next;
1135         };
1136
1137         my @UIDS;
1138         my $uid_number = 0;
1139         while (1) {
1140                 my $this_uid_text = '';
1141                 $uid_number++;
1142                 debug("Doing key $keyid, uid $uid_number");
1143                 my $tempdir = tempdir( "caff-$keyid-XXXXX", DIR => '/tmp/', CLEANUP => 1);
1144
1145                 # import into temporary gpghome
1146                 ###############################
1147                 my $result = import_key($tempdir, $asciikey);
1148                 unless ($result) {
1149                         warn ("Could not import $keyid into temporary gnupg.\n");
1150                         next;
1151                 };
1152
1153                 # prune it
1154                 ##########
1155                 $gpg = GnuPG::Interface->new();
1156                 $gpg->call( $CONFIG{'gpg-delsig'} );
1157                 $gpg->options->hash_init(
1158                         'homedir' => $tempdir,
1159                         'extra_args' => [ qw{ --no-auto-check-trustdb --trust-model=always --with-colons --fixed-list-mode --command-fd=0 --no-tty } ] );
1160                 ($inputfd, $stdoutfd, $stderrfd, $statusfd, $handles) = make_gpg_fds();
1161                 $pid = $gpg->wrap_call(
1162                         commands     => [ '--edit' ],
1163                         command_args => [ $keyid ],
1164                         handles      => $handles );
1165
1166                 debug("Starting edit session");
1167                 ($stdout, $stderr, $status) = readwrite_gpg('', $inputfd, $stdoutfd, $stderrfd, $statusfd, exitwhenstatusmatches => $KEYEDIT_PROMPT, nocloseinput => 1);
1168
1169                 # delete other uids
1170                 ###################
1171                 my $number_of_subkeys = 0;
1172                 my $i = 1;
1173                 my $have_one = 0;
1174                 my $is_uat = 0;
1175                 my $delete_some = 0;
1176                 debug("Parsing stdout output.");
1177                 for my $line (split /\n/, $stdout) {
1178                         debug("Checking line $line");
1179                         my ($type, undef, undef, undef, undef, undef, undef, undef, undef, $uidtext) = split /:/, $line;
1180                         if ($type eq 'sub') {
1181                                 $number_of_subkeys++;
1182                         };
1183                         next unless ($type eq 'uid' || $type eq 'uat');
1184                         debug("line is interesting.");
1185                         if ($uid_number != $i) {
1186                                 debug("mark for deletion.");
1187                                 readwrite_gpg("$i\n", $inputfd, $stdoutfd, $stderrfd, $statusfd, exitwhenstatusmatches => $KEYEDIT_PROMPT, nocloseinput => 1);
1188                                 $delete_some++;
1189                         } else {
1190                                 debug("keep it.");
1191                                 $have_one = 1;
1192                                 $this_uid_text = ($type eq 'uid') ? $uidtext : '[attribute]';
1193                                 $is_uat = $type eq 'uat';
1194                         };
1195                         $i++;
1196                 };
1197                 debug("Parsing stdout output done.");
1198                 unless ($have_one) {
1199                         debug("Uid ".($uid_number-1)." was the last, there is no $uid_number.");
1200                         info("key $keyid done.");
1201                         last;
1202                 };
1203
1204                 my $prune_some_sigs_on_uid;
1205                 my $prune_all_sigs_on_uid;
1206                 if ($is_uat) {
1207                         debug("handling attribute userid of key $keyid.");
1208                         if ($uid_number == 1) {
1209                                 debug(" attribute userid is #1, unmarking #2 for deletion.");
1210                                 readwrite_gpg("2\n", $inputfd, $stdoutfd, $stderrfd, $statusfd, exitwhenstatusmatches => $KEYEDIT_PROMPT, nocloseinput => 1);
1211                                 $delete_some--;
1212                                 $prune_some_sigs_on_uid = 1;
1213                                 $prune_all_sigs_on_uid = 2;
1214                         } else {
1215                                 debug("attribute userid is not #1, unmarking #1 for deletion.");
1216                                 readwrite_gpg("1\n", $inputfd, $stdoutfd, $stderrfd, $statusfd, exitwhenstatusmatches => $KEYEDIT_PROMPT, nocloseinput => 1);
1217                                 $delete_some--;
1218                                 $prune_some_sigs_on_uid = 2;
1219                                 $prune_all_sigs_on_uid = 1;
1220                         };
1221                 } else {
1222                         $prune_some_sigs_on_uid = 1;
1223                 };
1224
1225                 if ($delete_some) {
1226                         debug("need to delete $delete_some uids.");
1227                         readwrite_gpg("deluid\n", $inputfd, $stdoutfd, $stderrfd, $statusfd, exitwhenstatusmatches => $KEYEDIT_DELUID_PROMPT, nocloseinput => 1);
1228                         readwrite_gpg("yes\n", $inputfd, $stdoutfd, $stderrfd, $statusfd, exitwhenstatusmatches => $KEYEDIT_PROMPT, nocloseinput => 1);
1229                 };
1230
1231                 # delete subkeys
1232                 ################
1233                 if ($number_of_subkeys > 0) {
1234                         for (my $i=1; $i<=$number_of_subkeys; $i++) {
1235                                 readwrite_gpg("key $i\n", $inputfd, $stdoutfd, $stderrfd, $statusfd, exitwhenstatusmatches => $KEYEDIT_PROMPT, nocloseinput => 1);
1236                         };
1237                         readwrite_gpg("delkey\n", $inputfd, $stdoutfd, $stderrfd, $statusfd, exitwhenstatusmatches => $KEYEDIT_DELSUBKEY_PROMPT, nocloseinput => 1);
1238                         readwrite_gpg("yes\n", $inputfd, $stdoutfd, $stderrfd, $statusfd, exitwhenstatusmatches => $KEYEDIT_PROMPT, nocloseinput => 1);
1239                 };
1240
1241                 # delete signatures
1242                 ###################
1243                 readwrite_gpg("$prune_some_sigs_on_uid\n", $inputfd, $stdoutfd, $stderrfd, $statusfd, exitwhenstatusmatches => $KEYEDIT_PROMPT, nocloseinput => 1); # mark uid for delsig
1244                 my $signed_by_me = delete_signatures($inputfd, $stdoutfd, $stderrfd, $statusfd, $longkeyid, $CONFIG{'keyid'});
1245                 readwrite_gpg("$prune_some_sigs_on_uid\n", $inputfd, $stdoutfd, $stderrfd, $statusfd, exitwhenstatusmatches => $KEYEDIT_PROMPT, nocloseinput => 1); # unmark uid from delsig
1246                 if (defined $prune_all_sigs_on_uid) {
1247                         readwrite_gpg("$prune_all_sigs_on_uid\n", $inputfd, $stdoutfd, $stderrfd, $statusfd, exitwhenstatusmatches => $KEYEDIT_PROMPT, nocloseinput => 1); # mark uid for delsig
1248                         delete_signatures($inputfd, $stdoutfd, $stderrfd, $statusfd, $longkeyid, []);
1249                         readwrite_gpg("$prune_all_sigs_on_uid\n", $inputfd, $stdoutfd, $stderrfd, $statusfd, exitwhenstatusmatches => $KEYEDIT_PROMPT, nocloseinput => 1); # unmark uid from delsig
1250                 };
1251
1252
1253                 readwrite_gpg("save\n", $inputfd, $stdoutfd, $stderrfd, $statusfd);
1254                 waitpid $pid, 0;
1255
1256                 my $asciikey = export_key($tempdir, $keyid);
1257                 if ($asciikey eq '') {
1258                         warn ("No data from gpg for export $keyid\n");
1259                         next;
1260                 };
1261
1262                 if ($signed_by_me) {
1263                         if ($NOW - $signed_by_me > $CONFIG{'export-sig-age'} ) {
1264                                 my $write = ask("Signature on $this_uid_text is old.  Export?", 0, $params->{'export-old'}, $params->{'no-export-old'});
1265                                 next unless $write;
1266                         };
1267                         my $keydir = "$KEYSBASE/$DATE_STRING";
1268                         -d $keydir  || mkpath($keydir , 0, 0700) or die ("Cannot create $keydir $!\n");
1269
1270                         my $keyfile = "$keydir/$longkeyid.key.$uid_number.".sanitize_uid($this_uid_text).".asc";
1271                         open (KEY, ">$keyfile") or die ("Cannot open $keyfile: $!\n");
1272                         print KEY $asciikey;
1273                         close KEY;
1274
1275                         push @UIDS, { text => $this_uid_text, key => $asciikey, serial => $uid_number, "is_uat" => $is_uat };
1276
1277                         info("$longkeyid $uid_number $this_uid_text done.");
1278                 } else {
1279                         info("$longkeyid $uid_number $this_uid_text is not signed by me, not writing.");
1280                 };
1281         };
1282
1283         if (scalar @UIDS == 0) {
1284                 info("found no signed uids for $keyid");
1285         } else {
1286                 next if $CONFIG{'no-mail'}; # do not send mail
1287
1288                 my @attached;
1289                 for my $uid (@UIDS) {
1290                         trace("UID: $uid->{'text'}\n");
1291                         if ($uid->{'is_uat'}) {
1292                                 my $attach = ask("UID $uid->{'text'} is an attribute UID, attach it to every email sent?", 1);
1293                                 push @attached, $uid if $attach;
1294                         } elsif ($uid->{'text'} !~ /@/) {
1295                                 my $attach = ask("UID $uid->{'text'} is no email address, attach it to every email sent?", 1);
1296                                 push @attached, $uid if $attach;
1297                         };
1298                 };
1299
1300                 notice("Key has no encryption capabilities, mail will be sent unencrypted") unless $can_encrypt;
1301                 for my $uid (@UIDS) {
1302                         if (!$uid->{'is_uat'} && ($uid->{'text'} =~ /@/)) {
1303                                 my $address = $uid->{'text'};
1304                                 $address =~ s/.*<(.*)>.*/$1/;
1305                                 if (ask("Mail signature for $uid->{'text'} to '$address'?", 1, $CONFIG{'mail'})) {
1306                                         my $mail = send_mail($address, $can_encrypt, $longkeyid, $uid, @attached);
1307
1308                                         my $keydir = "$KEYSBASE/$DATE_STRING";
1309                                         my $mailfile = "$keydir/$longkeyid.mail.".$uid->{'serial'}.".".sanitize_uid($uid->{'text'});
1310                                         open (KEY, ">$mailfile") or die ("Cannot open $mailfile: $!\n");
1311                                         print KEY $mail;
1312                                         close KEY;
1313                                 };
1314                         };
1315                 };
1316         };
1317
1318 };
1319
1320 ###########################
1321 # the default mail template
1322 ###########################
1323
1324 __DATA__
1325 Hi,
1326
1327 please find attached the user id{(scalar @uids >= 2 ? 's' : '')}
1328 {foreach $uid (@uids) {
1329     $OUT .= "\t".$uid."\n";
1330 };}of your key {$key} signed by me.
1331
1332 If you have multiple user ids, I sent the signature for each user id
1333 separately to that user id's associated email address. You can import
1334 the signatures by running each through `gpg --import`.
1335
1336 Note that I did not upload your key to any keyservers. If you want this
1337 new signature to be available to others, please upload it yourself.
1338 With GnuPG this can be done using
1339         gpg --keyserver subkeys.pgp.net --send-key {$key}
1340
1341 If you have any questions, don't hesitate to ask.
1342
1343 Regards,
1344 {$owner}